The Maze ransomware gang is claiming on its data leak website to have stolen files from South Korean company LG Electronics. “Soon you’ll be able to know how the LG company have lost the source code of its projects for one very big telecommunications company, working worldwide,” the group says on its website.

Maze is known to not only encrypt organizations’ files and disrupt their systems, but also publish stolen sensitive information unless they pay a ransom.

BleepingComputer reported that among the screenshots posted on the Maze website as proof of an attack was an image of a split archive for a .KDZ file, which is the format for official stock firmware code from LG. BleepingComputer. The report says the firmware appears to have been developed for AT&T.

SC Media reached out to LG for comment.